Billing Automation
Handles the gnarly parts of subscription billing that everyone underestimates. Generates invoices with proper proration when customers upgrade mid-cycle, manages dunning workflows with configurable retry schedules for failed payments, and processes billing cycles with tax calculations. The subscription state machine covers trial to active to past due transitions cleanly. Most useful when you're building SaaS billing from scratch or replacing a brittle homegrown system. The dunning management alone will save you from manually chasing down failed credit cards, and the proration logic handles edge cases like leap years and month-end billing anchors that break naive implementations.
- skills.sh installs
- 11.6K
- GitHub stars
- 42.4K
- last updated
- Aug 21, 2026
Install
$ npx -y skills add wshobson/agents --skill billing-automation --agent claude-codeInstalls into .claude/skills of the current project.
Files
Billing Automation
Master automated billing systems including recurring billing, invoice generation, dunning management, proration, and tax calculation.
When to Use This Skill
- Implementing SaaS subscription billing
- Automating invoice generation and delivery
- Managing failed payment recovery (dunning)
- Calculating prorated charges for plan changes
- Handling sales tax, VAT, and GST
- Processing usage-based billing
- Managing billing cycles and renewals
Core Concepts
1. Billing Cycles
Common Intervals:
- Monthly (most common for SaaS)
- Annual (discounted long-term)
- Quarterly
- Weekly
- Custom (usage-based, per-seat)
2. Subscription States
trial → active → past_due → canceled
→ paused → resumed
3. Dunning Management
Automated process to recover failed payments through:
- Retry schedules
- Customer notifications
- Grace periods
- Account restrictions
4. Proration
Adjusting charges when:
- Upgrading/downgrading mid-cycle
- Adding/removing seats
- Changing billing frequency
Quick Start
from billing import BillingEngine, Subscription
# Initialize billing engine
billing = BillingEngine()
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- Repository
- github.com/wshobson/agents
- Categories
- DevOps & CI/CD, Automation & Workflows, Finance & Trading
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